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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
My solution passes every test I can come up with, including tests for special characters and empty Strings, yet it still fails finalSearchTestRareCases and finalSearchTestNonChar. I wish the instructions gave some indication of what cases are covered by those tests.